startup: Put it in chrome namespace.

chrome/browser/ui/startup/obsolete_os_info_bar.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_STARTUP_OBSOLETE_OS_INFO_BAR_H_
 #define CHROME_BROWSER_UI_STARTUP_OBSOLETE_OS_INFO_BAR_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/string16.h"
 #include "chrome/browser/tab_contents/link_infobar_delegate.h"
 #include "googleurl/src/gurl.h"
 
 class InfoBarTabHelper;
 
-namespace browser {
+namespace chrome {
 
 // An infobar that is run with a string and a "Learn More" link.
 class ObsoleteOSInfoBar : public LinkInfoBarDelegate {
  public:
   ObsoleteOSInfoBar(InfoBarTabHelper* infobar_helper,
                     const string16& message,
                     const GURL& url);
   virtual ~ObsoleteOSInfoBar();
 
   virtual string16 GetMessageTextWithOffset(size_t* link_offset) const OVERRIDE;
   virtual string16 GetLinkText() const OVERRIDE;
   virtual bool LinkClicked(WindowOpenDisposition disposition) OVERRIDE;
 
  private:
   const string16 message_;
   const GURL learn_more_url_;
 
   DISALLOW_COPY_AND_ASSIGN(ObsoleteOSInfoBar);
 };
 
-}  // namespace browser
+}  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_STARTUP_OBSOLETE_OS_INFO_BAR_H_